KR100293497B1 - Printing mask cleaning device and method - Google Patents

Abstract

The main removal section, which contacts the back of the mask via the cleaning paper, is installed behind the inlet, which is visible in the direction of movement of the air inlet, so that the cleaning paper is discharged from the opening of the mask by the solder paste attached to the back of the mask and suction through the inlet. By making it possible to remove all the solder paste, the solder paste laminated on the mask can be removed with high removal efficiency.

Description

PRINTING MASK CLEANING APPARATUS AND METHOD

The present invention is an apparatus for cleaning printing masks used to print and coat various printing materials, such as solder paste, conductor paste or insulator paste, on the surface to be printed. And to a method.

Until now, in the manufacture of electronic circuit boards, it is common practice to use solder paste for soldering electronic devices such as chip devices to printed boards. Solder paste printers are being used to print and coat solder paste in a desired pattern.

Conventionally, solder paste printing is performed using the method and apparatus described below. 15 and 16, reference numeral 1 denotes a printed substrate, 2 denotes a land on which the solder paste 4 is printed, 3 denotes a solder resist, and 5 denotes a land as desired. 2) A metal mask formed as an opening 6 of the pattern to be printed on 2, 7 represents a printing squeegee that can be linearly moved on the surface 5a of the mask 5. Printing the solder paste 4 on the printed board 1 positions the mask 5 to overlap on the printed board 1, and the rubber roller 7 contacts the mask 5 under an appropriate printing pressure. By linearly moving the rubber roller 7 at the counterpart, the solder paste 4 coated on the mask 5 is filled in the opening 6 of the mask 5, and then the printed substrate ( The mask 5 is spaced apart from 1), thereby printing and coating the solder paste 4 on the printed board 1 via the mask 5.

When such solder paste printing is performed continuously, as shown in Fig. 16, the solder paste 4 is attached to the back surface 5b of the mask 5 and laminated. Therefore, in general, in order to be able to remove the solder paste 4 attached to the rear surface 5b of the mask 5, a washing machine 9 as shown in Fig. 17 is provided in the printer. In this figure, reference numeral 10 denotes a cleaning rubber roller, 11 cleaning paper, 12 cleaning paper supply, and 13 cleaning paper take-up. 8 is a mask frame.

The operation of this cleaner 9 for removing the solder paste 4 is performed in the following manner. First, the washer 9 is moved to position I as a whole and the cleaning rubber roller 10 is lifted up until it comes in contact with the back surface 5b of the mask 5 via the cleaning paper 11. Keeping this state, the washer 9 is moved towards position II. When the washer 9 has been moved to position II, the cleaning rubber roller 10 is lowered, and then the cleaning paper take-up 13 takes up the cleaning paper 11 on which the cleaning was performed. Thus, fresh wash paper 11 is supplied from the wash paper supply 12. Subsequently, the washing rubber roller 10 is raised again and the washing machine 9 is moved from position II toward position I in the same manner as described above. When the washer 9 is moved to position I, the cleaning rubber roller is lowered and the washer 9 returns to the initial position, after which the desoldering operation is completed.

Recently, as illustrated in FIG. 18, in addition to the above-described configuration of the washer 9, an air jet 15 connected to the air jet mechanism 14 and an air intake connected to the air intake mechanism 16 ( A washer 30 has been proposed comprising a washing means with 17). Shown at 18 is a filter provided in the air intake 17.

In this washing operation with the cleaner 30, the air jet 15 and the air intake 17 are moved to position I, the air jet 15 is lowered and the air intake 17 is raised to Each front end is brought into contact with the mask 5 at the contacts 20, 21.

The contacts 20, 21 of the air intake 17 contact the backside 5b of the mask 5 via the cleaning paper 11 to prevent air from entering the inlet 17a through the contacts, Only through the opening 6 of the mask 5 is the air sucked into the inlet 17a. While maintaining this state, the air jet portion 15 and the air intake portion 17 are simultaneously moved along the mask 5 toward the position II, so that the inside of the opening 6 and the back surface 5b of the mask 5 are moved. The attached solder paste 4 is removed. That is, the air inlet 17 connected to the air intake mechanism 16 comes into contact with the rear surface 5b of the mask 5 through the cleaning paper 11 and corresponds to the air intake 17. 15 comes into contact with the back surface 5b of the mask 5. By inhalation by air jets and air intakes 17 from the air jets 15, the solder paste 4 adhered in and around the opening 6 of the mask 5 is dispersed or the mask 5. It flows toward the back side 5b of the. Thus, the dispersed debris of the solder paste 4 is collected in the washing paper 11, and when the cleaner 30 moves from position I to position II, the outflow debris of the solder paste 4 attached to the back surface 5b. It is collected in the washing paper 11 at this contact portion 20. After the debris removal of the solder paste 4 attached to the opening 6 is thus completed, the air intake by the air jet mechanism 14 and the air intake by the air intake mechanism 16 are stopped. Then, the air jet 15 is raised and the air intake 17 is lowered. Thereafter, the washing machine returns to its initial state, and the washing operation is completed.

This cleaning method comprising the step of air jet and air intake, in comparison with the cleaning method illustrated in FIG. 17, the solder paste 4 attached to the inside of the opening of the mask 5 and the inner circumferential surface thereof can be removed, so that soldering This has the advantage that the removal efficiency with respect to the paste 4 can be improved.

However, in the washing machine 30 described above, the contact portions 20, 21 of the air intake portion 17 contacting the rear surface 5b of the mask 5 are only through the opening 6, as described above. In order to allow air intake to the inlet 17a, only the inlet 17a is formed. Accordingly, in the prior art, there is no technical concept that the back surface 5b of the mask 5 is actively washed by the contact portions 20 and 21. Therefore, as shown in Fig. 19A, the span III of the contact portions 20, 21 seen in the moving direction of the washing machine 30 are each designed to be 1 mm or less. In the washing machine 30, the span IV of the suction port 17a seen in the moving direction of the washing machine 30 is 3 mm. 19A, 19B and 19C, the air jet 15 is not shown.

Therefore, in the washer 30 of the prior art structure, the area of the contact parts 20 and 21 which contact the mask 5 is small. Accordingly, as shown in FIGS. 19A to 19C, as the air intake 17 moves from position I to position II, between the back surface 5b of the mask 5 and the contacts 20, 21. The surface of these portions 11a, 11b of the cleaning paper 11 sandwiched between and adjacent portions thereof is easily covered with a lump of solder paste 4. In the cleaning paper 11 covered with the solder paste 4 in this way, it is impossible to collect the lumps of the solder paste 4 adhered to the back surface 5b of the mask 5, and even after the cleaning operation is completed, the mask ( This results in some solder paste 4 remaining unremoved in the back surface 5b and opening 6 of 5). This has the problem that in the subsequent printing process, the above-mentioned printing defects occur, including an off-plate effect and a solder ball bridge. 19A to 19C, the solder paste 4 is more accurately illustrated, so that spherical solder particles contained in the solder paste 4 are shown in an enlarged size.

Since the present invention is intended to solve this problem, an object of the present invention is to provide a cleaning method capable of cleaning printing materials such as solder paste with high removal efficiency over the entire cleaning operation range from the cleaning start position to the cleaning completion position; To provide a device.

1 is a diagram showing the configuration of a washing apparatus according to a first embodiment of the present invention.

2a, 2b, and 2c illustrate a sequential order of removing the solder paste attached by the cleaning apparatus shown in FIG.

3 shows a configuration of a modified example of the cleaning device of FIG.

4 is a diagram showing the configuration of a washing apparatus according to a second embodiment of the present invention.

FIG. 5 shows a configuration of a modified example of the washing apparatus shown in FIG.

6 is a perspective view of a cleaning nozzle of the cleaning device shown in FIG.

FIG. 7 is a perspective view showing a modified example of the cleaning nozzle shown in FIG.

FIG. 8 is a perspective view showing another modified example of the cleaning nozzle shown in FIG.

9 is a perspective view showing another modified example of the cleaning nozzle shown in FIG.

FIG. 10 is a perspective view showing another modified example of the cleaning nozzle shown in FIG.

FIG. 11 is a sectional view taken along the line IX-IX in FIG.

FIG. 12 is a sectional view taken along the line X-X in FIG.

FIG. 13 is a graph showing the relationship between the contact width and the removal efficiency of primary and secondary removals.

14 is a graph showing the relationship between the opening width, suction force, and removal efficiency of the suction port.

Fig. 15 is a sectional view showing how the solder paste is printed on the board using a mask.

FIG. 16 shows the mask and board visible when the mask is detached from the board after printing.

17 is a view showing the configuration of a conventional washing apparatus.

18 is a view showing the configuration of another conventional washing apparatus.

19A, 19B, and 19C illustrate, in sequential order, the process of removing the solder paste attached by the cleaning apparatus shown in FIG.

In carrying out the above and other features, according to the first aspect of the present invention, a printing mask in which an opening of a predetermined pattern is formed after a printing operation is performed using a printing mask when printing a printing material on a surface to be printed through the opening. There is provided a printing mask cleaning device for washing,

The printing mask cleaning device,

It is movable in contact with the cleaning sheet during the cleaning operation with respect to the back side of the printing mask in contact with the surface to be printed, has an inlet opening open opposite the back side of the printing mask, and extends in a direction perpendicular to the direction of movement thereof. A suction part;

In order to allow the printing material attached to the inside of the opening of the printing mask to be discharged toward the back side, the suction part inhales gas through the opening of the opening and the suction part while the suction part contacts the back side of the printing mask through the cleaning sheet. With a vacuum device,

A printing attached to the back side of the printing mask, which is installed behind the opening of the suction port visible in the direction of movement of the suction part, and is movable in the direction of movement of the suction part in a pressure contact with respect to the rear surface of the printing mask during the cleaning operation. The material and a main removal portion for wiping the cleaning sheet of mass of printing material discharged from the opening through suction.

According to a second aspect of the invention, there is provided a printing mask cleaning apparatus as described in the first aspect, wherein the span of the main removal portion measured in the direction of movement of the apparatus is at least 5 mm.

According to a third aspect of the invention, there is provided a printing mask cleaning apparatus as described in the first or second aspect, wherein the main removal portion is formed integrally with the suction portion.

According to a fourth aspect of the present invention, there is provided a printing mask cleaning apparatus as described in any one of the first to third features, wherein the printing mask is installed in front of the opening of the suction port visible in the moving direction of the suction portion, and the printing mask during the cleaning operation. It is further movable in the direction of movement of the suction portion in a pressure contact with respect to the back of the, further comprises an auxiliary removal unit for wiping the printing material attached to the back of the printing mask on the cleaning sheet.

According to a fifth aspect of the invention, there is provided a printing mask cleaning apparatus as described in the fourth aspect, wherein the span of the main removal portion seen in the direction of movement of the suction portion is larger than that of the auxiliary removal portion.

According to a sixth aspect of the present invention, there is provided a printing mask cleaning apparatus as described in the fourth or fifth aspect, wherein a combined span of the main removal portion and the auxiliary removal portion visible in the direction of movement of the suction portion is provided. It is more than 5mm.

According to a seventh aspect of the present invention, there is provided the printing mask cleaning apparatus described in any one of the fourth to sixth aspects, wherein the main removal portion and the auxiliary removal portion are integrally formed with the suction portion.

According to an eighth aspect of the invention, there is provided a printing mask cleaning apparatus as described in any one of the first to seventh aspects, wherein the opening area of the inlet of the inlet is the flow rate of gas passing through the inlet under inhalation. The area obtained by multiplying the rate by the flow velocity is maximum.

According to a ninth aspect of the present invention, there is provided a printing mask cleaning apparatus as described in any one of the first to eighth aspects, wherein the suction portion includes a plurality of suction ports arranged in a moving direction of the suction portion, and a moving direction of the suction portion. It includes a removal portion provided before and after the opening of each suction port shown in the.

According to a tenth aspect of the present invention, there is provided a printing mask cleaning apparatus as described in any one of the first to ninth aspects, wherein the intake port of the intake section is staggered along the length of the intake section, and the removal section It is provided before and after the opening of each suction port as seen in the moving direction of the suction part.

According to an eleventh aspect of the present invention, there is provided a printing mask cleaning apparatus as described in any one of the first to tenth aspects, wherein the surface of the suction portion contacting the back side of the printing mask through the cleaning sheet is the length of the suction portion. Bent in convex form along

According to a twelfth aspect of the present invention, there is provided a printing mask cleaning apparatus described in any one of the first to eleventh features, wherein the cleaning sheet is relatively movable relative to the movement of the suction portion.

According to a thirteenth aspect of the present invention, there is provided a printing mask device as described in any one of the fourth to twelfth features, wherein the main removal portion and the auxiliary removal portion are provided for the reciprocating movement of the suction portion on the back side of the printing mask. It is formed to have approximately the same length along the moving direction of the suction part, and the auxiliary removing part has almost the same function as the main removing part for wiping the cleaning sheet of printing material attached to the back side of the printing mask and the printing material mass discharged from the opening through suction. Do this.

According to a fourteenth aspect of the present invention, there is provided a printing mask cleaning method for cleaning a printing mask in which an opening of a predetermined pattern is formed after a printing operation is performed by using a printing mask when printing a printing material on a surface to be printed through the opening. Provided, moveable in contact with the cleaning sheet during the cleaning operation with respect to the back side of the printing mask in contact with the surface to be printed, having an inlet opening opposite the back side of the printing mask, and perpendicular to the direction of movement thereof A suction unit extending in the range of the suction unit;

In order to allow the printing material attached to the inside of the opening of the printing mask to be discharged toward the back side, the suction part inhales gas through the opening of the opening and the suction part while the suction part contacts the back side of the printing mask through the cleaning sheet. The cleaning operation is performed using a printing mask cleaning device including a vacuum device,

The method,

Printing material attached inside the opening of the printing mask by suction is placed on the back

After letting it go out,

A printing material attached to the back side of the printing mask, by a main removal portion disposed behind the opening of the inlet port visible in the direction of movement of the suction part and movable in the direction of movement of the suction part in pressure contact with respect to the back side of the printing mask during the cleaning operation; And wiping the printing material discharged from the opening by suction into the cleaning sheet.

According to a fifteenth aspect of the present invention, there is provided the printing mask cleaning method described in the fourteenth aspect, wherein, before the printing material attached to the inside of the opening of the printing mask is discharged to the back side of the printing mask, The printing material attached to the backside is wiped off the cleaning sheet by an auxiliary removal portion which is installed in front of the opening of the visible suction port and which is movable in the direction of movement of the suction portion in pressure contact with respect to the backside of the printing mask during the cleaning operation.

According to a sixteenth aspect of the present invention, there is provided a printing mask cleaning method described in the fifteenth aspect, wherein the span of the main removal portion seen in the direction of movement of the suction portion is greater than the length of the auxiliary removal portion seen in the direction of movement of the suction portion. Big.

According to a seventeenth aspect of the present invention, there is provided a printing mask cleaning method described in the fourteenth to sixteenth aspects, wherein the suction portion includes a plurality of suction ports arranged in the moving direction of the suction portion, and angles seen in the moving direction of the suction opening. Include removals installed before and after the opening of the inlet.

According to an eighteenth aspect of the present invention, there is provided a printing mask method as described in the fourteenth to seventeenth aspects, wherein the intake portions of the intake portion are staggered along the length of the intake portion, and the removal portion is viewed from the direction of movement of the intake portion. It is installed before and after the opening of the suction port.

These and other features of the present invention will become apparent from the following description taken in conjunction with the preferred embodiments with reference to the accompanying drawings.

Before proceeding with the description of the present invention, like parts are designated by like reference numerals throughout the accompanying drawings.

Now, as an embodiment of the present invention, a cleaning apparatus and method for cleaning a printing mask is described with reference to the drawings. In the drawings, device components that perform the same or similar functions are denoted by the same reference numerals. The washing method is performed by the washing apparatus. In various embodiments, a printed board is used as the surface to print as one example, but is not limited thereto. Similarly, soldering paste is illustrated as the printing material, but the printing material is not limited thereto. Various other printing materials can be used, such as conductor pastes and insulator pastes.

The printing mask 5 used in each embodiment is made of stainless steel and has a thickness of 0.14 mm. Each opening 6 formed in the mask 5 has a long slot form having a width of 0.15 mm and a length of 1.4 mm. Solder particles included in the solder paste 4 have a particle size of 10 to 30 μm. As an example of the cleaning sheet, the cleaning paper 11 is a nonwoven cotton fabric having a thickness of 0.5 mm to 1 mm.

[First Embodiment]

As already mentioned, the contacts 20, 21 of the air intake 17 of the washer 30 of the prior art do not include the technical concept that the backside 5b of the mask 5 is actively cleaned. In the washing apparatus 101 of the first embodiment, as shown in FIG. 1, behind the inlet of the air intake 17 seen in the moving direction V of the washing apparatus 101, the back surface 5b of the mask 5 is actively. ) Is provided separately from the air inlet 17.

The main removing part 111 is an elongate plate-like member extending along the length of the air intake 17 extending in the direction orthogonal to the moving direction V, and the contact portions 20, 21 of the air intake 17. It is drafted with the same material. The main removal unit 111 may be installed in the movable carriage 121 for moving the air suction mechanism 16, the air suction unit 17, the cleaning paper supply unit 12, the cleaning paper take-up 13, and the like. . Therefore, when the processing carriage 9121 is pressed against the rear surface 5b of the mask 5 and driven to move in the moving direction V by the driving unit 122 or a motor, for example, the air intake 17 Together with the movement direction V.

The span of the contact 111a of the main removal portion 111 seen in the moving direction V is solder paste from the back surface 5b of the mask 5 by the cleaning paper 11, as illustrated in FIG. When removal efficiency (90% or more in removing (4)) is a goal to be achieved, it is 5 mm or more. As is apparent from Fig. 13, when the span is larger than about 30 mm, improvement in removal efficiency is hardly expected. Therefore, it is desirable that the span be up to about 40 mm. In connection with the removal efficiency measurement of FIG. 13, while the air intake unit 17 performs air intake, the main removal unit 111 is moved from position I (hereinafter referred to as "cleaning start position") to position II (hereafter " It is assumed to be one-way moved on the back side 5b of the mask 5 up to " cleaning completed position "

In the washing apparatus 101 of the first embodiment, the air jet part 15 as used in the prior art is not provided.

The operation of the washing apparatus 101 of the first embodiment is described below.

After the solder paste printing is performed on the printed board in the desired pattern using the solder paste, the entire cleaning apparatus 101 moves to the cleaning start position I. The air intake 17 and main remover 111 rise toward the printing mask 5 and are in pressure contact with the back surface 5b of the mask 5 via the cleaning paper 11. The air intake mechanism 16 then starts air intake through the opening 6 of the mask 5. While maintaining this state, the movable carriage 121 in which the cleaning device 101 is installed is operated by the drive unit 122 to move in the moving direction V toward the cleaning completed position II, and the opening 6 of the mask 5 is provided. The solder paste 4 attached to the inner and rear surfaces 5b is removed.

That is, as shown in Fig. 2A, the solder paste 4 discharged from the inside of the opening 6 of the mask 5 toward the rear surface 5b of the mask 5 by the above described air suction, and the rear surface ( The solder paste 4 attached to 5b) will attach to the part VI of the cleaning paper 11 located between the contact 20 and the backside 5b of the air intake 17. However, as already mentioned, since the span of the contact portion 20 seen in the moving direction V is 1 mm, the part VI of the cleaning paper 11 is contained in the solder paste 4, so as shown in FIG. Undesired solder paste 112 residue is produced.

However, since the main removing section 111 is provided behind the air inlet 17a of the air intake section 17 seen in the moving direction V, the main removing section 111 and the mask 5 as shown in Fig. 2C. The solder paste 112, which has not been wiped out by the portion 의 of the cleaning paper 11 located between the back surfaces 5b, is wiped again. According to the test results performed to improve the washing apparatus of the present embodiment, a distance of about 2 mm from the edge 17b of the air inlet 17a of the air inlet 17 in the direction opposite to the moving direction V The area located within is the area where the cleaning paper 11 is easily saturated with the solder paste 4, and the area away from the end 17b by at least 2 mm opposite the moving direction is sufficient to wipe off the solder paste 4. Is confirmed. Therefore, in the first embodiment, the span of the main removing portion 111 seen in the moving direction V is designed to be at least 5 mm as mentioned above. In the case of the span of the main removal section 111 of 15 mm to 25 mm, the device of the prior art does not have the main removal section 111 and the span of the contact section 20 of the air intake section 17 is 2 mm. In comparison, about 10% improvement in removal efficiency can be achieved.

When the washing apparatus 101 moves to the washing completed position II, the air suction by the air suction mechanism 16 is stopped, and the air suction unit 17 and the main removing unit 111 are lowered. At this time, the motor 123 is driven to operate the cleaning paper take-up 13 to wind up the dirty cleaning paper, and new cleaning paper is supplied from the cleaning paper supply 12. Subsequently, the cleaning device 101 is returned to the cleaning start position I by the drive unit 122, and the cleaning operation on the mask 5 is completed.

As described above, in the washing apparatus 101 according to the first embodiment, the mask 5 has a high removal rate over the entire range from the washing start position I to the washing completion position II by the main removing unit 101 installed therein. The solder paste 4 in close contact with the phase can be removed.

Next, a better form of the washing apparatus 102 is illustrated in FIG. 3, where the auxiliary removing portion 113 is an inlet 17a of the air intake portion 17 seen in the moving direction V of the washing apparatus 101. ) In front of it. Like the main removal section 111, the secondary removal section 113 is an elongate plate-like member extending along the length of the air intake section 17 extending in the direction orthogonal to the moving direction V. It is provided on the movable carriage 121, and is manufactured from the same material as the main removal part 111. As shown in FIG. Therefore, during the process of cleaning the back surface 5b of the mask 5, the contact portion 113a of the auxiliary removing portion 113 is pressed against the back surface 5b through the cleaning paper 11, and the movable carriage 121 is pressed. Moves in the movement direction V together with the air intake unit 17 as the movement in the movement direction V.

The span of the contact portion 113a of the auxiliary removing portion 113 seen in the moving direction V can be made shorter than that of the contact portion 111a of the main removing portion 111 seen in the moving direction V as shown in FIG. 3. have. The reason for this is that the auxiliary removing part 113 is disposed in front of the suction port 17a seen in the moving direction V, so that the solder paste 4 discharged from the opening 6 of the mask 5 is not collected and the mask ( This is because only the solder paste 4 attached to the back surface 5b of 5) is collected in the cleaning paper 11.

As such, when both the auxiliary removing unit 113 and the main removing unit 111 are installed, the span of the contact portion 113a of the auxiliary removing unit 113 is the contact portion of the main removing unit 111 seen in the moving direction V. FIG. It can be shorter than that of 111a. Also, as already mentioned, the span of the main removal section 111 needs to be at least 2 mm. Therefore, the combined span of the primary removal portion 111 and the secondary removal portion 113 may be at least 5 mm. For example, the span of the main removal unit 111 may be 3 mm or more, and the span of the auxiliary removal unit 113 may be 2 mm or more. In the case where the washing apparatus 102 reciprocates between the washing start position I and the washing completion position II, it is no longer necessary to distinguish the main removing portion 111 and the auxiliary removing portion 113 from each other, so that the main removing portion 111 And the auxiliary removing unit 113 can be the same span.

In this manner, by providing the auxiliary removing unit 9113 in addition to the main removing unit 111, it is possible to collect a part of the solder paste 4 attached to the rear surface 5b of the mask 5, thereby increasing the removal efficiency. do.

Second Embodiment

In the above-described washing apparatuses 101 and 102 of the first embodiment, the main removing section 111, or the main removing section 111 and the auxiliary removing section 113 are provided separately from the air intake section 17. As shown in FIG. The cleaning device of the second embodiment has a main removal part 111 integrally formed with the air intake part 17 or a main removal part 111 and the auxiliary removal part 113 formed integrally with the air intake part 17. And a cleaning nozzle 131 with a combination. The washing device 103 shown in FIG. 4 is in the form of reciprocating between the washing start position I and the washing completion position II. Therefore, the cleaning nozzle 131 has a form in which the main removing unit 111 and the auxiliary removing unit 113 are integrally formed with the air suction unit 17, and thus, the main removing unit 111 and the auxiliary removing unit ( 113 is the same span seen in the direction of movement of the cleaning device.

This cleaning nozzle 131 is an elongated plate-shaped member which extends in the width direction of the mask 5 orthogonal to the reciprocation movement direction 로써, and extends about the same length as the width of the mask 5, as shown in FIG. In the center portion thereof, an elongated slot-shaped suction port 132 is formed in a plane extending along the length of the washing nozzle 131. Inlet 132 is connected to an air intake mechanism 16. In the cleaning nozzle 131 having such a structure, the contact portions 133 and 134 located in front of and behind the suction port 132 in the reciprocating movement direction 의 of the washing apparatus 103 are the main removing portion 111 and the auxiliary removing portion 113. Corresponds to each. The combined span of the contacts 133 and 134 visible in the reciprocating direction Ⅷ can be set to be at least 5 mm as already mentioned.

The opening width XI of the intake port 132 seen in the reciprocating direction 방향 of the intake port 132 is determined by the following method. The area of the inlet is set such that the value of the flow rate of the inlet air passing through the inlet is multiplied by the speed of the inlet air flow through the inlet. More specifically, the following formula: F = P × Q × V / g is known as a relational expression for expressing the force F of air blow. In this formula, P denotes the fluid density, Q denotes the flow rate of the fluid, V denotes the velocity of the fluid flow, and g denotes the acceleration of gravity. This relationship is also applicable when expressing suction force. An inlet having an inlet area in which the force F expressed by the above formula is maximized sucks and removes particles of the solder paste 4 attached to the inside of the opening 6 of the mask 5 and to the rear surface 5b thereof. Can produce the maximum force to do so.

Based on this theoretical view, as shown in Fig. 14, a measurement is made on the relationship between the opening width XI of the suction port, the suction force, and the removal efficiency for the solder paste 4. As is apparent from Fig. 14, the values of the removal efficiency and the suction force F are maximized when the opening width XI of the suction port of the washing nozzle is 6 mm. Therefore, in the present embodiment, the opening width XI of the suction port 132 of the washing nozzle 131 is set to 6 mm. However, similar effects can be obtained even when the opening width XI is 5 mm to 9 mm.

The manner of operation of the washing apparatus 103 with such washing nozzle 131 is the same as that of the washing apparatus 102 described above. Therefore, the description is omitted.

The cleaning device 103 may also include an air jet 15 connected to the air jet mechanism 14 shown in FIG. 18. Such a device is shown as cleaning device 104 in FIG. 5. In this case, the air jet 15 is pressed against the contacts 133, 134 of the cleaning nozzle 131 to facilitate more effective removal of the solder paste 4 from the contacts 133, 134, The air jet portion 15 preferably has a wall thickness corresponding to the thickness of the contact portions 133, 134 of the cleaning nozzle 131. Various cleaning nozzles described below may also include an air jet 15 having an air jet mechanism 14.

Modified examples of cleaning nozzles will be described below.

As shown in Fig. 7, it is possible to construct a washing nozzle 135 having two inlets 132a, 132b extending in parallel along the length of the washing nozzle. The opening width XI of the suction ports 132a and 132b is, for example, 6 mm.

In such a washing nozzle 135, among the contact portions 135a, 135b, 135c located in front of and behind the respective suction openings 132a, 132b seen in the reciprocating movement direction 접촉, the contact portion 135b is always connected to the main removing portion 111. Correspondingly, the contact portions 135a and 135c correspond to the main removing portion 111 or the auxiliary removing portion 113 as the case may be. In this way, two suction ports are provided along the reciprocating movement path, so that one contact part corresponding to the main removing part 111 is positioned immediately behind the suction ports 132a and 132b. Therefore, the span of each contact 135a, 135b, 135c of the cleaning nozzle 135 seen in the reciprocating direction Ⅷ can be made shorter than in the case of the cleaning nozzle 131. Therefore, in the washing nozzle 135, the entire span of each of the contact portions 135a, 135b, 135c seen in the reciprocating movement direction Ⅷ can be 5 mm or more and about 40 mm or less.

Thus, having two suction ports 132a and 132b means that two contact portions corresponding to the main removal portion 111 are provided in the advancing direction. Therefore, the cleaning nozzle 135 can further increase the removal of the solder paste 4 compared to the cleaning nozzle 131.

In the washing nozzle 135, each of the inlets 132a and 132b extends continuously in a straight line along the longitudinal direction of the washing nozzle 135. In addition, as shown in FIG. 8, it is possible to configure the washing nozzle 136 having the suction ports 137 staggered from each other and having the suction ports 137 spaced at predetermined intervals along the longitudinal direction. The cleaning nozzle 136 has two inlets 137 arranged along the reciprocating path VII. The opening width XI of each inlet 137 is 6 mm as already mentioned.

The reason why the inlets 137 are staggered is explained below. That is, when the cleaning nozzle is made of a soft material, for example "duracon", in the cleaning nozzle 135 shown in Figure 7, between the inlet 132a and the inlet 132b There is a possibility that the width of the contact portion 135b is narrow, resulting in insufficient strength of the cleaning nozzle, and the back surface 5b of the mask 5 and the contact portion 135b do not come into contact with each other through the cleaning paper 11.

Therefore, by staggering the suction ports, the cleaning nozzles prevent the lack of strength from occurring, thereby ensuring positive contact between the cleaning nozzles and the back surface 5b through the cleaning paper 11. The term "duracone" is a common name for polyacetal.

In the above described cleaning nozzles 131, 135, 136, the inlets 132, 137 have an elongated slot configuration in plan view, but as shown in FIG. 9, in the plan view as the inlet 139. It may be circular. The cleaning nozzle 138 has these inlets 139 staggered. In the cleaning nozzle 138, the pair of inlet ports 139 is arranged along the reciprocating path Ⅷ. Each inlet 139 is 3 to 5 mm in diameter.

In addition, as illustrated in FIG. 10, the cleaning nozzle 140 has a contact surface 141 contacting the rear surface 5b of the mask 5 through the cleaning paper 11 such that the cleaning nozzle 140 is convex along the length of the cleaning nozzle 140. It may have a shape to bend. In the case where the cleaning nozzle 140 having the curved contact surface 141 is used, when the cleaning nozzle 140 contacts the rear surface 5b of the mask 5 through the cleaning paper 11, during the cleaning operation, The mask 5 is forcibly bent in a concave shape along the contact surface 141. Thereby, it is possible to increase the contact between the back surface 5b of the mask 5 and the contact surface 141 of the cleaning nozzle 140 via the cleaning paper 11, so that the removal rate for the solder paste 4 ( The removal ratio can be further increased.

The cleaning nozzle 140 is in the form of having a single inlet as in the cleaning nozzle 131, but may be in the form of having such an inlet as formed in the cleaning nozzle 135, 136 or 138.

In the foregoing description, it is assumed that each of the cleaning nozzles 131, 135, 136, 138, 140 is used in the cleaning device of the reciprocating type. However, this cleaning nozzle may be used in a cleaning device of the type applied to one way travel from the cleaning start position I to the cleaning completion position II. In the case where the cleaning device is designed for one-way movement, for example, the cleaning nozzle 131 is the contact surface 133a of the contacts 133, 134 located in front of and behind the inlet 132, as shown in FIG. 11. , 134a may be inclined slightly upwards in a direction opposite to the moving direction, respectively, for contact with the cleaning paper 11. Also, for example, the cleaning nozzle 136 may be configured such that, as shown in FIG. 12, the contact surface 136a of the cleaning nozzle 136 is inclined slightly upward in its entirety in a direction opposite to the moving direction. It may be.

By constructing the cleaning nozzle such that the contact surface with the cleaning paper 11 is inclined slightly upward in the direction opposite to the moving direction, the cleaning nozzle is directed through the cleaning paper 11 to the rear surface 5b of the mask 5 during the cleaning operation. It can be expected that the pressing force of the cleaning nozzle gradually increases in the direction opposite to the direction of movement when pressed against. This allows the cleaning nozzle to wipe the solder paste 4 more effectively.

In the above-described cleaning apparatuses 101, 102, 103, 104, the removal of the solder paste 4 by the cleaning paper 11 is completed, and the air intake portion 17 and the removal portions 111, 113, or After the cleaning nozzle 131 is lowered, the cleaning paper take-up 13 is driven by the motor 123 to take up the dirty cleaning paper 11 and supply new cleaning paper. . However, the cleaning operation is not limited to this mode of operation. During the cleaning process in which the cleaning paper 11 is in contact with the back surface 5b of the mask 5, the cleaning paper take-up 13 is operated by the motor 123 to take up the cleaning paper 11, The cleaning device may be moved. Through this operation, there is no contamination in the portion of the cleaning paper sandwiched between the contact portions 133 and 134 such as the removing portions 111 and 113 or the cleaning nozzle 131 and the back surface 5b of the mask 5. Since it is possible to supply fresh cleaning paper 11, the solder paste 4 can be removed from the mask 5 with a higher removal efficiency.

The timing for take-up of the cleaning paper 11 by the cleaning paper take-up 13 is such that, for example, the cleaning nozzle 131 makes the back side of the mask 5 through the cleaning paper 11. The cleaning paper 11 may be set to be always take-up when moving while maintaining contact with 5b, or may be set such that the take-up is made whenever the cleaning apparatus moves a certain distance.

As described above, according to the first embodiment of the present invention for the cleaning device and the second embodiment for the cleaning method, when viewed in the moving direction of the suction part having the suction port, the main removal part is installed behind the opening of the suction port, By removing the printing material attached to the openings and the backside, the printing material attached to the mask can be cleaned with higher removal efficiency. Therefore, during the printing process after cleaning, occurrence of printing defects such as a plate-missing effect and a solder ball bridge can be prevented.

All of the disclosures of Japanese Patent Application No. 8-261660, filed on January 1, 1996, including the specification, claims, drawings, and abstract, are incorporated herein by reference.

While the present invention has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, it is to be understood that various changes and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as falling within the scope of the invention as defined in the appended claims unless they depart therefrom.

Claims (18)

In the printing mask cleaning apparatus for cleaning the printing mask (5) in which the opening (6) of the predetermined pattern is formed after a printing operation is performed by using a printing mask when printing the printing material (4) on the surface to be printed through the opening. , The printing mask cleaning device, It has a suction port 17a which is movable in contact with the back surface 5b of the printing mask in contact with the surface to be printed through the cleaning sheet 11 during the cleaning operation and is open to face the back side of the printing mask. A suction part 17 extending in a direction orthogonal to the moving direction; In order to allow the printing material attached to the inside of the opening of the printing mask to be discharged toward the back side, the suction part inhales gas through the opening of the opening and the suction part while the suction part contacts the back side of the printing mask through the cleaning sheet. The vacuum device 16, A printing attached to the rear side of the printing mask, installed behind the opening of the suction port visible in the direction of movement of the suction part, and movable in the direction of movement of the suction part in a pressure contact with respect to the back side of the printing mask during the cleaning operation; And a main removal portion (111) for wiping the material and the printing material mass discharged from the opening through suction to the cleaning sheet. The printing mask cleaning apparatus according to claim 1, wherein a span of the main removal portion measured in the moving direction of the apparatus is 5 mm or more. 3. The printing mask cleaning apparatus according to claim 1 or 2, wherein the main removal portion is formed integrally with the suction portion. The method according to any one of claims 1 to 2, which is provided in front of the opening of the suction port visible in the moving direction of the suction part, and is movable in the moving direction of the suction part in pressure contact with respect to the back side of the printing mask during the cleaning operation. And a second removing unit (113) for wiping the printing material attached to the back of the printing mask to the cleaning sheet. 5. The printing mask cleaning apparatus according to claim 4, wherein the span of the main removal portion seen in the direction of movement of the suction portion is larger than that of the auxiliary removal portion. 5. The printing mask cleaning apparatus according to claim 4, wherein the combined span of the main removing portion and the auxiliary removing portion seen in the moving direction of the suction portion is 5 mm or more. 5. The printing mask cleaning apparatus according to claim 4, wherein the main removal portion and the auxiliary removal portion are formed integrally with the suction portion. The printing mask cleaning apparatus according to any one of claims 1 to 2, wherein the opening area of the suction port of the suction unit is an area where a product of the flow rate and the flow rate of the gas passing through the suction port under suction is maximized. The printing according to any one of claims 1 to 2, wherein the suction unit includes a plurality of suction ports arranged in the moving direction of the suction unit, and a removal unit provided before and after the opening of each suction port seen in the moving direction of the suction unit. Mask cleaner. The printing mask cleaning apparatus according to any one of claims 1 to 2, wherein the suction ports of the suction unit are staggered along the length of the suction unit, and the removal unit is provided before and after the opening of each suction port visible in the moving direction of the suction unit. . The printing mask cleaning apparatus according to any one of claims 1 to 2, wherein the surface of the suction portion contacting the rear surface of the printing mask through the cleaning sheet is bent in a convex shape along the length of the suction portion. The printing mask cleaning apparatus according to any one of claims 1 to 2, wherein the cleaning sheet is movable relative to the movement of the suction unit. 5. The printing apparatus according to claim 4, wherein the main removal portion and the auxiliary removal portion are formed to have approximately the same length along the moving direction of the suction portion for reciprocating movement of the suction portion on the back side of the printing mask, and the auxiliary removal portion is printed on the back side of the printing mask. A printing mask cleaning device, characterized in that it performs approximately the same function as the main removal unit for wiping the printing material mass discharged from the opening through the material and the suction onto the cleaning sheet. After the printing operation is performed using the printing mask when printing the printing material 4 on the surface to be printed through the opening, the printing mask cleaning method for cleaning the printing mask 5 in which the opening 6 of a predetermined pattern is formed. In It has a suction port 17a which is movable in contact with the back surface 5b of the printing mask in contact with the surface to be printed through the cleaning sheet 11 during the cleaning operation and is open to face the back side of the printing mask. A suction part extending in a direction orthogonal to the moving direction; In order to allow the printing material attached to the inside of the opening of the printing mask to be discharged toward the back side, the suction part inhales gas through the opening of the opening and the suction part while the suction part contacts the back side of the printing mask through the cleaning sheet. The cleaning operation is performed using the printing mask cleaning device including the vacuum device 16, The method, After inhalation causes the printing material attached inside the opening of the printing mask to be discharged to the back side, It is disposed behind the opening of the printing mask by a main removing part 111 which is disposed behind the opening of the suction port visible in the direction of movement of the suction part and is movable in the direction of movement of the suction part in pressure contact with respect to the back side of the printing mask during the cleaning operation. And cleaning the printing material and the printing material discharged from the opening by suction to the cleaning sheet. 15. The printing material according to claim 14, wherein the printing material attached inside the opening of the printing mask is installed in front of the opening of the suction port visible in the moving direction of the suction portion before being discharged to the rear surface of the printing mask, and is in pressure contact with the back surface of the printing mask during the cleaning operation. And a printing material attached to the rear surface by the auxiliary removing unit 113 which is movable in the moving direction of the suction unit in one state, and is wiped off the cleaning sheet. 16. The method of claim 15, wherein the span of the primary removal portion seen in the direction of movement of the suction portion is greater than the length of the secondary removal portion seen in the direction of movement of the suction portion. The printing mask according to any one of claims 14 to 16, wherein the suction part includes a plurality of suction ports arranged in the moving direction of the suction part, and a removal part provided before and after the opening of each suction port seen in the moving direction of the suction part. How to wash. The printing mask cleaning method according to claim 14, wherein the suction ports of the suction unit are staggered along the length of the suction unit, and the removal unit is installed before and after the opening of each suction port visible in the moving direction of the suction unit.

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